http://reply.papertrans.cn/2/191/19006/19006-31.png
http://reply.papertrans.cn/2/191/19006/19006-32.png
Submitted on: 21 April 2016.
Revised on: 31 May 2016.
Accepted on: 28 June 2016.
___________________JOURNAL OF PUBLIC HEALTH MANAGEMENT AND PRACTICE
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http://reply.papertrans.cn/2/191/19006/19006-35.png
Submitted on: 27 February 2020.
Revised on: 17 May 2020.
Accepted on: 28 May 2020.
___________________JOURNAL OF PUBLIC HEALTH MANAGEMENT AND PRACTICE